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| Entered date | Event description | |
|---|---|---|
| ENS 43055 | 18 December 2006 13:55:00 | A press release issued for an inadvertent actuation of the emergency sirens. This item is reportable under 50.72(b)(2)(xi) as offsite notification as an event of public interest. The licensee was performing scheduled silent testing of the off-site emergency sirens. During the test a signal for the sirens to sound was sent in error, and the sirens sounded. There was no emergency. Licensee notified the NRC Resident Inspector. |
| ENS 40531 | 18 February 2004 17:47:00 | At 1500 on 2/16/2004, a tractor trailer with two intermodals (sea land containers) arrived at SSES (Susquehanna Steam Electric Station) from Race, LLC placarded radioactive 'empty'. Upon inspection it was determined that one of the intermodals had equipment in it contrary to the bill of lading and DOT regulations. This equipment was surveyed and found to be non-contaminated and non-radioactive. There was no radioactive exposure to any individuals as a result. Operations personnel were made aware of this event at 1630 on 2/18/2004. It was determined that this event may be of public significance and is reportable under 10CFR 50.72 (b)(2)(xi). The Pennsylvania Emergency Management Agency (PEMA) is being notified of this incident. The licensee notified NRC Resident Inspector. |
| ENS 40134 | 5 September 2003 11:22:00 | At 09:30 EDT, Unit 1 was performing the HPCI Quarterly Flow verification surveillance. Shortly after the initiation of the system an abnormally loud bang was heard. System flow of approximately 5200 gpm and discharge pressure of approximately 1300 psi was achieved at approximately 09:33. Approximately 4 seconds after reaching rated system flow HPCI discharge pressure increased to approximately 1675 psi and system flow dropped to approximately 2700 gpm. HPCI had been declared inoperable at 08:35 EDT to perform the surveillance and will remain inoperable until the cause of the loss of system flow is corrected. Because HPCI is a single train ECCS (Emergency Core Cooling System) safety system, this event results in the loss of an entire safety function which requires an 8 hour ENS notification in accordance with 10CFR50.72(b)(3)(v) and the guidance provided under NUREG-1022, rev. 2. There are no other ECCS systems presently out of service. Reactor Core Isolation Cooling (RCIC) is fully operable and HPCI entered Tech Spec 3.5.1 (14 day Limiting Condition of Operation). All other ECCS systems are fully operable. The NRC Resident Inspector was notified of this event by the licensee.
On 09/05/2003, PPL Susquehanna LLC made an ENS notification per 10CFR50.72(b)(3)(v) in response to an apparent loss of the HPCI (High Pressure Coolant Injection) safety function. In the event, results of HPCI Quarterly Flow Surveillance testing did not meet acceptance criteria established for the system. Investigation into the cause of the failed HPCI surveillance revealed a 360-degree weld crack on the HPCI Test Line to Condensate Storage Tank (CST) Valve, HV155F008. HV155F008 is not in the reactor vessel injection flowpath. The impact of this crack, which was located between the valve seat cage assembly and the valve body, was that the HPCI Test Line to CST valve was not capable of throttling over the full range of HPCI system flows. Valve performance became erratic at higher flows because the valve seat cage was lifted out of the valve body into the flow path, increasing system resistance, and preventing attainment of design flow in the HPCI test loop. While the ability to effectively test the HPCI system using the test return path to the CST was compromised, the HPCI injection flowpath to the reactor vessel was not adversely affected by the damaged valve. Accordingly, the HPCI system maintained full capability for providing sufficient coolant to the reactor vessel in the event of a small break loss-of-coolant accident. Because the HPCI safety function was not compromised by the identified test path obstruction, this ENS notification is being retracted. The Licensee has notified the NRC Resident Inspector. Notified R1DO (Cobey). |